The ascent starts at 5,300m. In a beautiful base camp aside a small lake (water source, take water filters or barrels -were you can pack your equipment- and to clarificate the water -let sand to drop all night-). From base camp you have the most wonderful sight of Mt. Everest you can imagine, just above is Kalapattar Rock hill at 5545m.After a 3 hrs walk (loaded) trough an easy hike terrain you will reach camp 1 or advanced base camp 5700m. To let your equipment and supply nearby. After this you will face a 500m. Elevation difference trough a 40 to 65 degrees slopes, 100m. Horizontal traverse, steep and expose to wind narrow ridges, some 5m. Ice wall, one tunnel climb. Pumori has many rock and mixed climb (not to need rock pitons but take some in case for the fixed rope) and spring might be more rock falling. If you have good Sherpa, Could be good for spring season.